spring+Jpa多數(shù)據(jù)源配置的方法示例

更新時間：2018年08月12日 14:23:58 作者：BryantChang

這篇文章主要介紹了spring+Jpa多數(shù)據(jù)源配置的方法示例，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

今天臨下班時遇到了一個需求，我的管理平臺需要從不同的數(shù)據(jù)庫中獲取數(shù)據(jù)信息，這就需要進行Spring的多數(shù)據(jù)源配置，對于這種配置，第一次永遠都是痛苦的，不過經(jīng)歷了這次的折磨，今后肯定會對這種配置印象深刻。我們這里簡單回顧一下流程。

我們配置了兩個數(shù)據(jù)庫，一個是公司的數(shù)據(jù)庫，另一個是我本地的一個數(shù)據(jù)庫。首先是application.yml的配置(其中對于公司的數(shù)據(jù)庫我們采取了假的地址，而本機的數(shù)據(jù)庫是真是存在對應的表和庫的)

數(shù)據(jù)庫信息：

數(shù)據(jù)表信息：

1、application.yml

datasource:
 primary:
  url: jdbc:mysql://companyurl.com:5002/db1
  username: unameq
  password: passwd1
  driver-class-name: com.mysql.jdbc.Driver
 secondary:
  url: jdbc:mysql://localhost:3306/django_test
  username: root
  password: 123456
  driver-class-name: com.mysql.jdbc.Driver
 jpa:
 database-platform: org.hibernate.dialect.MySQL5Dialect
 hibernate:
  ddl-auto: update
  show-sql: true

2、創(chuàng)建總的DataSource配置文件以及兩個Repostory的配置文件PrimaryConfig以及SecondaryConfig

DataSourceConfig

@Configuration
public class DataSourceConfig {
 @Bean(name = "primaryDataSource")
 @Qualifier("primaryDataSource")
 @ConfigurationProperties(prefix="spring.datasource.primary")//對應的數(shù)據(jù)庫配置信息
 public DataSource primaryDataSource() {
  return DataSourceBuilder.create().build();
 }

 @Bean(name = "secondaryDataSource")
 @Qualifier("secondaryDataSource")
 @Primary
 @ConfigurationProperties(prefix="spring.datasource.secondary")
 public DataSource secondaryDataSource() {
  return DataSourceBuilder.create().build();
 }
}

PrimaryConfig

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef="entityManagerFactoryPrimary",
  transactionManagerRef="transactionManagerPrimary",
  basePackages= { "數(shù)據(jù)訪問層所在的包" }) //設置Repository所在位置
public class PrimaryConfig {

 @Autowired @Qualifier("primaryDataSource")
 private DataSource primaryDataSource;

 @Primary
 @Bean(name = "entityManagerPrimary")
 public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
  return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
 }

 @Primary
 @Bean(name = "entityManagerFactoryPrimary")
 public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary (EntityManagerFactoryBuilder builder) {
  return builder
    .dataSource(primaryDataSource)
    .properties(getVendorProperties(primaryDataSource))
    .packages("實體類所在的包") //設置實體類所在位置
    .persistenceUnit("primaryPersistenceUnit")
    .build();
 }

 @Autowired
 private JpaProperties jpaProperties;

 private Map<String, String> getVendorProperties(DataSource dataSource) {
  return jpaProperties.getHibernateProperties(dataSource);
 }

 @Primary
 @Bean(name = "transactionManagerPrimary")
 public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
  return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
 }
}

SecondaryConfig

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
  entityManagerFactoryRef="entityManagerFactorySecondary",
  transactionManagerRef="transactionManagerSecondary",
  basePackages= { "數(shù)據(jù)訪問層所在的包" }) //設置Repository所在位置
public class SecondaryConfig {

 @Autowired
 @Qualifier("secondaryDataSource")
 private DataSource secondaryDataSource;

 @Bean(name = "entityManagerSecondary")
 public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
  return entityManagerFactorySecondary(builder).getObject().createEntityManager();
 }

 @Bean(name = "entityManagerFactorySecondary")
 public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
  return builder
    .dataSource(secondaryDataSource)
    .properties(getVendorProperties(secondaryDataSource))
    .packages("實體類所在的包") //設置實體類所在位置
    .persistenceUnit("secondaryPersistenceUnit")
    .build();
 }

 @Autowired
 private JpaProperties jpaProperties;

 private Map<String, String> getVendorProperties(DataSource dataSource) {
  return jpaProperties.getHibernateProperties(dataSource);
 }

 @Bean(name = "transactionManagerSecondary")
 PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
  return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
 }
}

3、然后我對于本地數(shù)據(jù)庫新建實體類PeoplePerson

@Entity
@Table(name = "people_person")
public class PeoplePerson implements Serializable {
 @Id
 @GeneratedValue
 private Integer id;

 @Column(name = "name")
 private String name;

 @Column(name = "age")
 private Integer age;

 public PeoplePerson() {
 }

 public Integer getId() {
  return id;
 }

 public void setId(Integer id) {
  this.id = id;
 }

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public Integer getAge() {
  return age;
 }

 public void setAge(Integer age) {
  this.age = age;
 }

 @Override
 public String toString() {
  return "PeoplePerson{" +
    "id=" + id +
    ", name='" + name + '\'' +
    ", age=" + age +
    '}';
 }
}

并創(chuàng)建對應的Repositoy，PeoplePersonDao并創(chuàng)建了一個findAll的方法

@Transactional@Repositorypublic interface PeoplePersonDao extends JpaRepository<PeoplePerson, Long> 
 { 
   List<PeoplePerson> findAll();
 }

4、最后，在test包中進行測試

@Autowired
private PeoplePersonDao peoplePersonDao;
@Test
public void testMultiDataSource() {
 List<PeoplePerson> list = peoplePersonDao.findAll();
 for (int i = 0; i < list.size(); i++) {
  logger.info(list.get(i).toString());
 }
}

測試結果